Prevent credentials from being leaked in backtrace in some instances (#9817)

* Prevent credentials from being leak in backtrace in some instances
Particularly before the user is authenticated

* fix test

LibreNMS/Config.php

@@ -27,6 +27,7 @@ namespace LibreNMS;
 
 use App\Models\GraphType;
 use Illuminate\Database\QueryException;
+use Illuminate\Support\Arr;
 use LibreNMS\DB\Eloquent;
 
 class Config
@@ -130,6 +131,18 @@ class Config
         return $curr;
     }
 
+    /**
+     * Unset a config setting
+     * or multiple
+     *
+     * @param string|array $key
+     */
+    public static function forget($key)
+    {
+        global $config;
+        Arr::forget($config, $key);
+    }
+
     /**
      * Get a setting from a device, if that is not set,
      * fall back to the global config setting prefixed by $global_prefix